package com.xiaolun.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/**
 * 说明
 * 1. SimpleChannelInboundHandler 是 ChannelInboundHandlerAdapter
 * 2. HttpObject 客户端和服务器端相互通讯的数据被封装成 HttpObject
 */
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

	//channelRead0 读取客户端数据
	@Override
	protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {

		System.out.println("对应的channel=" + ctx.channel() + " pipeline=" + ctx
				.pipeline() + " 通过pipeline获取channel" + ctx.pipeline().channel());

		System.out.println("当前ctx的handler=" + ctx.handler());

		//判断 msg 是不是 httprequest请求
		if (msg instanceof HttpRequest) {

			System.out.println("ctx 类型=" + ctx.getClass());
			System.out.println("pipeline hashcode" + ctx.pipeline().hashCode() + " TestHttpServerHandler hash=" + this.hashCode());
			System.out.println("msg 类型=" + msg.getClass());
			System.out.println("客户端地址" + ctx.channel().remoteAddress());

			//msg包含请求的路径等信息
			HttpRequest httpRequest = (HttpRequest) msg;
			//获取uri, 过滤指定的资源
			URI uri = new URI(httpRequest.uri());
			if ("/favicon.ico".equals(uri.getPath())) {
				System.out.println("请求了 favicon.ico, 不做响应");
				return;
			}
			//回复信息给浏览器 [http协议]
			ByteBuf content = Unpooled.copiedBuffer("hello, 我是服务器", CharsetUtil.UTF_8);
			//构造一个http的响应，即 httpresponse
			FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
			response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain;charset=utf-8");
			response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
			//将构建好 response返回
			ctx.writeAndFlush(response);
		}
	}
}
